Parallellines\purpleD{\text{Parallel lines}}Parallel linesstart color purpleD, P, a, r, a, l, l, e, l, space, l, i, n, e, s, end color purpleD are always the same distance apart from each other — no matter how far they are extended, they will never meet.

Want to learn more about parallel and perpendicular lines? Check out this video.

Practice set 1: Identify parallel and perpendicular lines

Problem 1A

Which of the following pairs of sides in △GAZ\triangle GAZ△GAZtriangle, G, A, Z are perpendicular?